Malicious PDF — malware analysis report

Static analysis result for SHA-256 095de2040f17b563…

MALICIOUS

PDF

76.5 KB Created: 2021-09-14 05:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a9d7d5d0a306f65d199521db7f6aff46 SHA-1: 7bb69ab7c135c4835b14ad770f3bac251c60b233 SHA-256: 095de2040f17b5635fe904eeb6c96f39efe8d3e39484a0118db01ec0d3243b8f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves using these links to lure victims into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://huntic.ru/uplcv?utm_term=new+headway+upper+intermediate+4th+edition+workbook+with+key+pdf PDF link annotation
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131121c4bf26---javepamor.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/63097809185.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/49120574335.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/79138812558.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/18465581539.pdfIn PDF document text
    • http://guchen.ru/d/files/64442027546.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/tigujizopapawufisizif.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/dozuki.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109111519392139.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/21922358382.pdfIn PDF document text
    • http://altus.pl/userfiles/file/ninuxibokofef.pdfIn PDF document text
    • http://kunbot.com/upload/files/fufuvunejesagogupesoto.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/9775508715.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/88503721477.pdfIn PDF document text
    • https://norservis.info/files/files/39690022282.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/49201339299.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/23775208908.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/sojezumoxuwek.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613285793dcde---tevul.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306cca84867---rodezawigafavajefulo.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/96815177790.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301c987ab79---zutavatakifomafojen.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/dijilarebanaxujewij.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC434 11136 bytes
SHA-256: 87a856019c5557e927336a932de00a982ac2f5f42ff544c2e14553455737f195
font_01_sfnt_off0000dddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EF 17876 bytes
SHA-256: 92859b48d03aba006f111f8cb55473ad6dd46c82c86dde416e20c273f66d0761

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